Charles maschmeyer



(No Model.)

C. MASCHMBYER.

EXTPNSPON LAMP SUPPORT. No. 432,278. Patented -July 15, 189.0..

UNITED VSTATES e PATENT OFFICE.'

CHARLES MASCHMEYER, OE MERIDEN, CONNECTICUT, ASSIGNOR TO THE EDWARD MILLER d: COMPANY, OF SAME PLACE.

EXTENSION LAMP-SUPPORT.v

SPECIFICATION forming part of LettersPatent No. 432,278, dated July 15, 1890.

Application inea March 10, lego.

f semina'. 343,282. momma.)

To @ZZ whmii, it may concern:

Be it known that I, CHARLES MASCHMEYER, of Meriden, in the county of New Haven and State of Connecticut, have invented anewlrn# provernent in Extension Lamp-Supports, (A;) and I do hereby vdeclare the following, when taken in connection with accompanying drawings and'theletters of reference marked thereon,to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification,'and represent, in'- Figure l, a vertical central section of so much of the standard as necessary to illustrate the invention; Fig. 2,a side view of the inner tube, showing the oblique or inclined surface of said inner tube with the heini,y

spherical rollers resting thereon; Fig. 3, .a transverse section on line .fr of Fig. l.

This invention relates to an improvement in that class of adjustable lamp-fixtures'specially adapted for standard lamps and in which the standard is of a telescopic character, one part supported from the floor, the other part adjustable vertically therein and carrying the lamp, and so that the lamp may be raised or lowered to different elevations, the object of the invention being to provide a simple locking device which will securely hold the adjustable portion of the standard at any point to which it may be desired to set it, such locking device permitting the standard to be raised to take the lamp to a higher elevation, but prevent its descent, ex-

- cept after the manipulation of thelocking de- `the lamp, also in the usual manner.

vice; and the invention consists in the construction, as hereinafter described, and particularly recited in the claim.

A represents the stationary tube, which is adapted to be supported in a stationary position in the usual manner, as by a foot or base to rest upon the iioor. l

B represents a jacket or outer tube, which is applied as a cover for thetube A, not, however, essential to the invention.

Within the tube A a second tube C is arranged, and so as to slide freely therein in a telescopic manner. This second tube cri-ies t its lower end the tube C presents a face D oblique to the axis, and so as to form an 1nclined plane on the tube C within the tube A. This oblique portion of the end of the -tube is re-enforced, as at E, to give it an increased strength, and also to form a shoulder F within the tube C. Through the tube C a vertical rod G is arranged, which extends down through the lower end of the tube C and upward above the outer tube, and at its upper end is provided with a handle H,which extends laterally through an openingl in the side of the tube C. Around the rod G, and between the shoulder F and the hub of the handle H, a suitable spring J is arranged. (Here represented as a spiral spring.) The tendency of this spring, resting upon the shoulder F and bearing upward against the handle H, is to force and hold t-he rod G in its up position. The rod G at itslower end is flattened, as at K, Figs. 2 and 3, the plane of the flat sides being at substantially right angles to the transverse plane of the oblique surface D at the end of the tube C. Transversely through this llat portion K of the rod G an axle L is arranged, and on this axle two hemispherical rollers M N are pla-ced. These two rollers M N together present substantially a spherical surface, as seenl in Fig. 3, of somewhat less diameter than the diameter of the tube A, and so that under the action of the spring G, as the rod is raised, the said rollers will be drawn onto the inclined surface of the tube C, and between it and the opposite side of the tube A, and thus, under the force of the spring, produce a wedgelike action between the tubes A and C. These rollers thus act as a cramp between the said two tubes,

tending to force the tube C into such frictional contact with the interior of the tube A as to hold the said tube C against descent whenever the said rollers shall be left free to be thus drawn up by the action -of their ICO G be pressed downward, as by applying the thumb to the handle II and as indicated in broken lilies, Fig. l, the rollers will be forced down and away from their cramped positions between the two tubes, thus leaving the tube C to be pressed downward until the desired elevation shall be reached. Then, the handle II released, the spring reacts and draws the rollers again into their cramping position to engage the two tubes. If the tube C be raised, it naturally draws away from the rollers to a suiiicient extent to reduce the frietion between the two tubes, so that the tube C may be readily raised without necessarily pressing the rollers from their cramped posi tion. Yet the rollers may be relieved from their cramped position when raising the tube C, as described, for its descent.

By making the rollers of spherical shape, as described, the bearing-surface between the two rollers and the stationary tube 'correspend so nearly as to give a considerable bearing-surfaee and so as to prevent indenting` the tube when the rollers are brought to the said position, thereby having the advantage of a ball-shaped locking device, and at the S same time the division of the ball into two parts permits its attachment to a rod, whereby it may be thrown into or forced from its locked position and at all times be within the control of the person operating the fixture.

for the class of lamps commonly called standard lamps, it will be understood that it may be applied to other classes of lamp-1 supports in which telescopic rods are employed. For the handle any of the known substitutes for operatin the rod may be employed.

I am aware that telescopic tubes made adjustable have been provided with an inclined surface upon the inner tube, combined with a ball or spherical-shaped roller arranged between said inclined surface and the opposed inner surface of the outer tube so as to automatically cramp or interlock the two. I therefore do not claim, broadly, the employment of a sphericahshaped locking device between the stationary and adjustable portions of the tube, the one portion having an oblique surface upon which the said spherical roller may operate; but

Vhat I do claim is- In an extension-support for lamps, consisting of two tubes telescopically arranged, one tube stationary and the other movable, the inner tube constructed to present a surface within the outer tube oblique to the axis, combined with a rod within th'e said inner tube extending to a point between the said oblique surface of the inner tube and the corresponding inner surface of the outer tube, a pair of hemispherieal rollers arranged upon an axis through the said end of said rod, one each side said rod, and the said rollers located so as to take a bearing upon the said inclined surface of theinner tube and the opposing inner surface of the'outer tube, the said rod extending through the said inner tube from said rollers to a point outside the inner tube, and provided with a suitable handle at its other end by which vertical movement may be imparted to said rod, with Vllile the invention is especially adapted CHARLES MASCHMEYER.

\Vitnesscs:

GEO. L. Cocinas, GEO. M. CHITTENDEN. 

